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serviceWorker.js
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serviceWorker.js
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/* eslint-disable no-console */
self.importScripts("js/idb.js");
const objectStore = "objectStore";
// eslint-disable-next-line no-undef
const restaurantDB = idb.open("restaurant-store", 1, upgradeDB => {
upgradeDB.createObjectStore(objectStore);
});
// eslint-disable-next-line no-undef
const favoriteDb = idb.open("favorite-store", 1, upgradeDB => {
upgradeDB.createObjectStore(objectStore);
});
// eslint-disable-next-line no-undef
const reviewDB = idb.open("review-store", 1, upgradeDB => {
upgradeDB.createObjectStore(objectStore);
});
const staticCache = "restaurant-static";
const staticAssets = [
"/",
"/index.html",
"/restaurant.html",
"/js/main.js",
"/js/dbhelper.js",
"/js/restaurant_info.js",
"/css/styles.css",
"/img/1.jpg", "/img/1.webp",
"/img/2.jpg", "/img/2.webp",
"/img/3.jpg", "/img/3.webp",
"/img/4.jpg", "/img/4.webp",
"/img/5.jpg", "/img/5.webp",
"/img/6.jpg", "/img/6.webp",
"/img/7.jpg", "/img/7.webp",
"/img/8.jpg", "/img/8.webp",
"/img/9.jpg", "/img/9.webp",
"/img/10.jpg", "/img/10.jpg",
"https://fonts.gstatic.com/s/roboto/v18/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2",
"https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4AMP6lQ.woff2",
];
/**
* Install event
*/
self.addEventListener("install", event => {
event.waitUntil(
caches.open(staticCache)
.then(cache => cache.addAll(staticAssets))
.catch(error => console.error("Something happened", error))
);
});
/**
* Activate event
*/
self.addEventListener("activate", event => {
event.waitUntil(
caches.keys()
.then(cacheNames => Promise.all(
cacheNames.filter(cacheName => cacheName.startsWith("restaurant-") &&
!staticCache.includes(cacheName))
.map(cacheName => caches.delete(cacheName))
))
.catch(error => console.error("Something happened", error))
);
});
/**
* Message event
*/
self.addEventListener("message", event => {
if (event.data.type === "favorite") {
return favoriteDb.then(db =>
db.transaction(objectStore, "readwrite").objectStore(objectStore).put(event.data.payload, "favorite")// eslint-disable-line promise/no-nesting
.then(result => console.info("Favorite Operation succeed", result))
.catch(error => console.error("Favorite operation failed", error)));
}
if (event.data.type === "review") {
return reviewDB.then(db =>
db.transaction(objectStore, "readwrite").objectStore(objectStore).put(event.data.payload, "review")// eslint-disable-line promise/no-nesting
.then(result => console.info("Review Operation succeed", result))
.catch(error => console.error("Review operation failed", error)));
}
});
self.addEventListener("sync", event => {
const url = "https://mws-restaurants-stage-3.herokuapp.com";
if (event.tag === "Synchronize") {
reviewDB.then(db => db.transaction(objectStore).objectStore(objectStore).getAll()// eslint-disable-line promise/no-nesting
.then(reviews => reviews.map(review => fetch(`${url}/reviews/`, {body: review, method: "POST"}))))
.catch(error => console.error("something failed", error));
favoriteDb.then(db => db.transaction(objectStore).objectStore(objectStore).getAll()// eslint-disable-line promise/no-nesting
.then(favorites => favorites.map(favorite => fetch(`${url}/restaurants/${favorite.id}/?is_favorite=${favorite.is_favorite}`))))
.catch(error => console.error("something failed", error));
}
});
/**
* Fetch from network event
*/
self.addEventListener("fetch", event => {
const port = event.request.url.split("/")[2].split(":")[1];
if (event.request.method === "GET" &&
(event.request.url.search("localhost") === -1) || // calling for heroku and google maps api
(port !== undefined && port === "1337") // calling for local backend running on port 1337
) {
event.respondWith(serveResponseIdb(event.request));
} else {
event.respondWith(serveResource(event.request));
}
});
/**
* Serve response from indexedDB
* @param {Request} request
* @return {Promise<Response | void>}
*/
const serveResponseIdb = request => {
restaurantDB
.then(db => {
const response = new Response(db.transaction(objectStore).objectStore(objectStore).get(request.url));
return Promise.resolve(response);// eslint-disable-line promise/no-return-wrap
})
.catch(error => console.error("Unable to access cache: ", error));
return fetch(request)
.then(fetchResponse => {
if (fetchResponse.headers.get("Content-Type").match(/application\/json/i)) {
restaurantDB.then(db => {// eslint-disable-line promise/always-return, promise/no-nesting
fetchResponse.clone().json().then(content => {// eslint-disable-line promise/catch-or-return, promise/no-nesting
const tx = db.transaction(objectStore, "readwrite");
tx.objectStore(objectStore)// eslint-disable-line promise/no-nesting
.put(content, request.url)
.then(response => console.info("put operation succeed: ", response))
.catch(error => console.error("Put operation failed: ", error));
return tx.complete;
});
})
.catch(error => console.error("Error opening transaction: ", error));
}
return fetchResponse;
})
.catch(error => console.error("Fetch Error: ", error));
};
/**
* Serve resource from cache or network
* @param {Request} request client request
* @return {Promise<Response | void>}
*/
const serveResource = request =>
caches.open(staticCache)
.then(cache =>
cache.match(request)// eslint-disable-line promise/no-nesting
.then(response => {
if (response) {
return response;
}
return fetch(request) // eslint-disable-line promise/no-nesting
.then(networkResponse => {
cache.put(request, networkResponse.clone()) // eslint-disable-line promise/no-nesting
.then(() => console.info("Caching succeed"))
.catch(error => console.error("Caching failed", error));
return networkResponse;
});
}))
.catch(error => console.error("Something happened", error));